A. 8, 20, 28
B. 16, 28, 36
C. 20, 35, 45
D. 24, 42, 54
Let their present ages be 4x, 7x and 9x years respectively
Then, (4x-8) + (7x-8) + (9x-8) = 56
=> 20x = 80
=> x = 4
=> Their present ages are 4x = 16 years, 7x = 28 years and 9x = 36 years respectively